Packing off tool



Sept. 22, 1931. R. M. MARR PACKING OFF T001.

Filed July 12. 1929 A TT ORNE Y Patented Sept. 22, 1931 narran STATES PATENTv OFFICE ZAL M. MARR, 0F OKLAHOMA CITY, OKLAHOMA, ASSIGNOR OF ONE-HALF T0 AMERI- CAN RGN t MACHINE W'ORKS, ENC., 0F OKLAHOMA CITY, CIKLAHOMA, A CORPORA- TON '0F OKLAHGMA PACKING oFF Toor.

Application filed July 12, 1929.

'l drill pipe.

ln rotary drilling, the drillfbit often sticks due to cavings at the bottom of the well and if the drill pipe has an opening or if it dep velops a fracture above the bit due to resistance offered by the cavings the drilling fluid willv follow the course of least resistance and return to the top of the well through the fracture and will not circulate to the bottom of the well to wash away the cavings and free i 1K5 the bit.

Y 2.0 fracture.

lt is also an object of theinvention to provide a packer which may be readily set in one of the tool joints. ln accomplishing these and other objects l a5 of the invention, Iliave provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein: y

Fig. 1 is a central section of the lower 30 portion of a well hole. and rotary drill pipe therein. and illustrating my device in packing position in the drill pipe.

Fig. is an enlarged central section of the device and adjacent portions of the drill pipe,

illustratino the packing tool in s aced rela- CD i tion with a oint of the drill pipe.

Fig. 3 is a similar section but illustrating the tool in packing relation with the drill pipe joint.

Fig. ft is section on the line 4.-4, Fig. 2.

Fi 5 is a perspective view of the dog element whereby 'the packing is effected.

Referring in. detail to the drawings:

1 designates a well hole, and 2 a pipe dependifra in the hole and illustrated as a string of drill pipe employed in rotary drilloperation and having a bit 3 provided with blades l for drilling a hole upon rotation of the pipe.

The ordinary string of drill pipe con- Serial No. 377,752.

sists of sections connected by the usual pipe couplings 5 and about every third section connected by tool joints 6 consisting of taper pins and thread boxes 7 and 8 respectively, so that the pipe joints may be quickly made when the drill pipe is being run into the well n or broken when it is being pulled.

Due to caving of the walls of the hole or other causes, a mass of material 9 may become packed around the bit, and hampers operation thereof so that attempted rotation of the pipe often fractures the drill pipe particularly at the couplings 5. Then drilling fluid instead of being discharged through the bit to wash away the cavings escapes through the fracture and returns to the top of the well without moving the cavings and the drilling tool cannot be operated. Therefore in'order to release the material and lower the stuck drilling tool for removal, I provide for the insertion of a string of pipe 10 comprising a conduit having smaller diameter than the drill pipe and which is lowered into the hole through the drill pipe, for conducting and discharging the drilling fluid below the fracture and inducing circulation around the bit.

In order to restrain the fluid to the bit and lower end of the drill pipe. the conduit is provided at its lower end with a packing device 11 presently described for effecting a sealing ioint between the drill pipe and one of the tool oints below the fracture.

The device 11 comprises a tubular body 12 connected to the conduit by a coupling 13. and having a rounded lower end 14 for guiding the device through the stringr of drill pipe and past the tool joints thereof.

The upper end 15 of the body is reduced formingr a shoulder 16, and a dog element comprising a tubular member 17 slidable on the end 15 is provided with a plurality of depending dogs 18 adapted to move longitudinallyin grooves 19 of the body. Y

Mounted on the upper end of the body and encircling the tubular member 17 is a compressible sleeve or packing member f2() formed of rubber or the like anchored by the shoulder 16 against downward movement and having its upper edge engaged by a flange 21 comprising a ring threaded ou the upper end oi the tubular member 17.

The boi; 8 of the tool oi i lower shoulder 2Q and the l ly projecting' hook or feet 23 ada ten to engage the lower shoulder ot the boi: 8 v'hen the conduit is lifted to restrain the sleeve and cause the same to expand against thV inner Wall ot the boX 7.

The dogs comprise resilient itingers secured to the lower 'edge of the tubular mein ier, and have lower portions 2li normally curved outwardly to project trie hooks outwardly from the body for assu-.rhin engagement of the hooks with the tool joint 6. The hoolis have beveled lower faces or edges 2 adapted to erf gage and slide over inward reject `n *be drill pipe and tool joints upon do u nward movement oi the dog' element therein, and cause the hooks to retracted into the 0frooves to permit the device to pass the projections.

rl`he tubular member is substanti er than the reduced end portion ll y shortl'he bodv.

so that the upper end portions ot the floss extend between the rubber sley when the sleeve in normal A washer 26 is preferably shoulder i6, to receive the lower e e sleeve and support the neripherc. portion of the sleeve when the saine is expanded.

rl`he floors of the Qrooves 19 preterubly taper'outwardly downwardly at their lower ends and merge with the periphery ot the body adjacent'the rounded u thereof?, but at points in spaced relation with the vip` to comprise slanting' tor retniv ine; the dons in engagement with the tool joint shoulder.

ln using` the inventio the conduit is lowered through the drill pipe, the hooks tz'- ing projecting' shoulders or joints and the like to depress the resilient dogs into the grooves and permit the device to pass 'the jo:-

Temporary engagement ot the hools with a projection will tend to shift the 'tubular member upwardly the body. whereupon the upperredife of the tubular member will engage the coupling' i3 and restrain the dog); element to force sli ling; 'movement ot the hooks over the projection.

The tubular member will tend to move longitudinally within the. rubber sleeve during' the upward movement described, but lthe uncurved portions oi.: the dogis extending` substantially in alignment with the tubular member, will' permit the dop; elementto move within the sleeve without tending; to compress the same.

vrllbe sleeve may be carried upwardly by the doo; element due to trictional engaeement therewith. but will be returned to anchored position on the shoulder ot the body idog' element falls by gravity or is restrained as later described.

`When the dogs have passed the desired tool joint, the conduit is elevated, whereupon the projecting` hooks engage the shoulder 22 and restrain the sleeve, which is thereupon automatically compressed and expanded to engage the inner periphery otI the drill pipe or 'the tool therein, as illustrated in Fig. 3. rllhe conduit may be retained in this position, to effect a seal between the tubular bit and the drill pipe. Fluid passed through the conduit will therefore be discharged to the bottom of the bit and against the bottom olf the iv ll hole, and pressure will be built up in the bit, since the fluid cannot pass the packing.

Thus it is apparent that with tie use of my device, the iluid is restrained from the tractured portion of the drill pipe, and therefore etl'cctively dischared to the bottom of the woll hole for circulation around the bit.

l'ilhat l claim and desire to secure by Letters Patent is:

l. In a packing o tool in combination with tubing' having an internal shoulder, a tubular vbody having` longitudinal grooves, a don' element including' a tubular member slidable on said body and having resilient ouftbent i nuera slidable in said grooves, a packing member, means on the tubular member for engaging one end of the packing member. and means on the fingers for engaging the internal shoulder to effect Compression ot the packing' member upon upward movement ot the tubular body in the tubinof.

ln a packing` off tool. in combination with tubing` including` a joint, a tubular body having longitudinal grooves and a reduced rortion torn I' a shoulder, a dog clementincluding` a tubular member slidable on said reduced vportion and having` fingers provided with hook portions adapted to engage said joint and slidable in said grooves, a compressible Asleeve on said reduced portion, and means 2-f1abling` the dog` elementto press the sleeve against said shoulder when the hooks engage the joint for compressinnr the sleeve.

3. 'ln a packro oft tool, a body having lonl.Qitudinal grooves and an annular shoulder. an uisible puel-iin@ member on said body adapted to cuando said shoulder, a dop,` element sliduble on the body and includine` hooks adapte to Y, tbe dogeleincnt, and moans said don' element for bearim; on the sleeve to urnev the, same towa rd the shoulder tor expandinoj the sleeve when be dog olc-lneut is operated.

et. ln combination with' rotary drill pipe, inclu-dino; a tool joint and a conduit movable in the drill nipo' oil tool iuclndinir a tubular body mounted ,in the lower end ot the. conduit, an einansible "leere on said bor y, .aiidmeans eng.A 'cable iv h said tool joint upon nor-iard movement of the conduit for expanding the sleeve against the tool joint.

5. ln combination with rotary drill pipe including` a tool joint having an internal shoulder, and a conduit movable in the drill pipe, a packing 0E tool including a body mounted on the conduit, a packing member on said body, and means engageable with said shoulder upon upward movement of the conduit for engaging the packing member with the tool joint.

6. In combination with rotary drill pipe including` a tool joint having` an internal shoulder, and a conduit movable in the drill pipe, a packing ofi tool including a tubular body mounted on the lower end of the conduit, an expansible sleeve on said body, and means engageable with said shoulder upon upward movement of the conduit for expanding the sleeve against the tool joint.

7. In combination with tubing` including a coupling having an internal shoulder, and a. conduit movable in the tubing, a packing' o tool comprising a body connected with the conduit, a` dog element slidable on the body, an expansible member on said bodv, means for anchoring said member to the body, meansr on the dog' element adapted to bear against the anchored sleeve to expand the same against the tubing, and means on the dog element engapgeable with said shoulder upon movement of the conduit to restrain the dog element for eectinp' expansion of said member.

8. In combination with rotary drill pipe including a. tool joint havino an internal shoulder, and conduit movable in the pipe, a packingV o tool comprising a body connected with the conduit and having a reduced portion, a doa" element including' a tubular member slid-.able on the reduced portion of the body` anexpansible member. means for anchoring` said member to the body, means on the dop; element adapted to bear against the anchored sleeve to expand the same` against the drill pipe, and means on the dog element engageable with said shoulder upon upward movement of the conduit to restrain the dog element for effecting expansion of said member.

9. In a packin tool. in combination with tubing,V including; a joint, a tubular bodv having; longitudinal Grooves and a reduced portion forming a shoulder. a dog element including; a tubular member slidable on said reduced portion and outwardly directed re-V silient lingers provided with hook portions adapted to engage said joint and slidable in .l grooves. said hook portions having tapered faces to engage the oint and compress said iinpgers upon downward travel of the dog element. a compressible sleeve on said reduced portion, and means enabling the doe` element to press the sleeve` against said shoulder when the hooks engage the joint for compressing the sleeve.

In testimony whereof I my signature.

RIZAL M. MARR. 

